One of mine is a chewer, so my advice is all from long term experience of desperately trying to protect rented flats! :shock: I've recently moved and we hardly have any problems here, I think its cos I prepared the lounge well before the buns moved in. Anyhow, try the following:
wires - hose pipe is fab, split it down its length, put the wire in and tape it up, or take the plug off, feed the wire through and rewire the plug.
carpet corners - I found that he only really chews the carpet in the corners so I got some clear perspex and put it flat on the carpet in the corners with something on it to keep it there - bunny bed, coffee table, etc etc
dark corners - block them all off, don't let your bunny go places like behind the sofa or in small gaps between say a book case and the wall - it'll be the end of the carpet/skirtingboard/wall!
fluffy cushions - this sounds odd but I've blocked places up with fluffy cushions cos he tends to sit and lick the cushions rather than chewing them or moving them.
yellow pages - there was one bit of carpet that Charlie bun kept chewing and he just wouldn't stop, so I ended up putting a yellow pages on it, he started shredding that instead, Ok so its a bit of a mess factory but at least the carpet remained intact.
I've also used that stuff you buy to spray on animals to stop them licking wounds - I covered the skirting boards in it, it worked (for a while at least), could be worth trying on smaller things!
The best of luck!